Influence evaluation of some factors in the mechanical properties of binder mixtures using design and analysis of asymmetric fractional factorial experiments technique / Avaliação da influência de alguns fatores nas propriedades mecânicas de misturas asfálticas densas, à luz da técnica de planejamento e análise de experimentos fatoriais fracionários assimétricos

AUTOR(ES)

Jisela Aparecida Santanna Greco

DATA DE PUBLICAÇÃO

2004

RESUMO

This work deals with the influence of some factors in the mechanical behavior of asphalt mixtures stability and flexibility. Three types of binders were tested, conventional one, modified with 4,5% of SBS and modified with 20% of recycled tire rubber. Two aggregate gradations were tested, center of B and C gradations of DNER (1997). Four binder contents were chosen based on the air voids and film thickness. Three types of long-term aging were tested, not aged, aged in a forced-draft oven for 5 days at 85ºC and aged through weather exposition for the period of 4 months. Two types of short-term aging were tested; not aged and aged in a forced-draft oven for 4 hours at 135ºC. The technique of design and analysis of asymmetric fractional factorial experiments was used for the simultaneous analysis of the factors. The mechanical behavior of the mixtures was evaluated based on indirect tensile strength test, resilient modulus test and static and dynamic creep tests. The results of the analysis of variance allowed the identification of factors with significant influence in the answers. The influence of the factors in the mixtures properties was established through statistical models of behavior. The results showed that modified binders improves the mixtures resistance in relation to fatigue and to permanent deformation. The aging processes increased the resilient modulus of the mixtures, but also decreased its capacity of elastic return, resulting in a lost of fatigue resistance. On the other hand, the permanent deformation resistance of the aging mixtures increased, including the mixtures with modified binders cases.

ASSUNTO(S)

asfaltos modificados deformação permanent experimentos fatoriais fracionários aging asphalt mixtures envelhecimento permanent deformation módulo de resiliência fractional factorial designs misturas asfálticas resilient modulus modified binders

Documentos Relacionados

• Considerations on adhesion and moisture susceptibility of asphalt mixtures by mean of mechanical properties
• Optimal treatment choice and blocking for the construction of fractional factorial designs
• Estudo das propriedades mecânicas de misturas asfálticas convencionais e modificadas
• BLACK OIL RESERVOIRS SIMULATOR PROXY USING COMPUTATIONAL INTELLIGENCE AND FRACTIONAL FACTORIAL DESIGN OF EXPERIMENTS
• Propriedades mecânicas de misturas asfálticas mornas com adição de zeólitas sintetizadas